update 7/24/2015: Fellow rider JRT tells us the real story in the comments section below.

Remember that odd and very lengthy delay near Grafton on Monday 6/8? And the fact that @MBTA_CR wouldn't tell us what it was other than "police activity?" Well...here's a snippet of the relevant section of the police log, courtesy of http://www.graftonpolice.com/:

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As of late October 2017, the author is an MBTA employee. Blog posts prior to that time were created when I was NOT affiliated with the MBTA nor Keolis and therefore were my own opinion. Blog posts after October 2017 are my own personal statements and do not represent any official position or opinion of the MBTA and should not be construed as having been endorsed by the MBTA.